mdBook/src/bin/test.rs

use clap::{App, ArgMatches, SubCommand};
use mdbook::MDBook;
use mdbook::errors::Result;
use get_book_dir;

// Create clap subcommand arguments
pub fn make_subcommand<'a, 'b>() -> App<'a, 'b> {
    SubCommand::with_name("test")
        .about("Test that code samples compile")
        .arg_from_usage(
            "-L, --library-path [DIR]... 'directory to add to crate search path'",
        )
}

// test command implementation
pub fn execute(args: &ArgMatches) -> Result<()> {
    let library_paths: Vec<&str> = args.values_of("library-path")
                                       .map(|v| v.collect())
                                       .unwrap_or_default();
    let book_dir = get_book_dir(args);
    let mut book = MDBook::load(&book_dir)?;

    book.test(library_paths)?;

    Ok(())
}